With the increasing connections of generation using power electronics and transmission network capacity using embedded FACST devices, the measurement of higher than 50th voltage harmonics is of growing importance. This paper presents how to use the recent proposed Power Quality Sensor (PQSensor) adding onto the existing Capacitor Voltage Transformer (CVT) infrastructure to measure high orders of voltage harmonics and voltage transients accurately. A CVT circuit with the PQSensor was modelled and simulated. The PQSensor performances were evaluated and tested under various CVT burden conditions. The results show that the PQsensor has excellent linear frequency response, in terms of magnitude and phase, over the studied frequency range from 10Hz to 10 kHz. The sensitivity studies show that the PQSensor frequency response performances are only affected the change of the capacitors of the CVT, and not the burden of the CVT.